Voter Registration Totals as of March 1, 2019
| County |
Constitution |
Democratic |
Libertarian |
Republican |
Unaffiliated |
Total Registered |
| Ada |
672 |
48,015 |
3,191 |
106,608 |
101,440 |
259,926 |
| Adams |
16 |
186 |
14 |
1,696 |
681 |
2,593 |
| Bannock |
136 |
4,991 |
410 |
17,171 |
18,382 |
41,089 |
| Bear Lake |
16 |
118 |
12 |
2,587 |
577 |
3,310 |
| Benewah |
23 |
529 |
33 |
2,440 |
2,001 |
5,026 |
| Bingham |
78 |
1,718 |
90 |
12,670 |
5,722 |
20,275 |
| Blaine |
16 |
3,199 |
120 |
3,383 |
7,052 |
13,770 |
| Boise |
24 |
347 |
42 |
2,937 |
1,415 |
4,765 |
| Bonner |
148 |
2,686 |
240 |
14,990 |
7,990 |
26,054 |
| Bonneville |
186 |
4,188 |
437 |
30,085 |
18,048 |
52,944 |
| Boundary |
26 |
433 |
56 |
4,145 |
1,527 |
6,187 |
| Butte |
5 |
65 |
4 |
1,141 |
278 |
1,493 |
| Camas |
6 |
37 |
6 |
463 |
206 |
718 |
| Canyon |
438 |
10,737 |
933 |
48,125 |
34,399 |
94,631 |
| Caribou |
20 |
113 |
15 |
2,711 |
844 |
3,703 |
| Cassia |
31 |
506 |
42 |
6,710 |
2,060 |
9,349 |
| Clark |
2 |
17 |
2 |
304 |
49 |
374 |
| Clearwater |
11 |
359 |
29 |
2,258 |
1,698 |
4,355 |
| Custer |
4 |
149 |
19 |
1,983 |
642 |
2,797 |
| Elmore |
46 |
1,012 |
90 |
6,009 |
3,336 |
10,493 |
| Franklin |
46 |
177 |
30 |
4,635 |
1,316 |
6,204 |
| Fremont |
28 |
295 |
25 |
5,069 |
1,304 |
6,721 |
| Gem |
52 |
631 |
56 |
6,209 |
2,601 |
9,549 |
| Gooding |
21 |
554 |
34 |
3,777 |
1,732 |
6,118 |
| Idaho |
33 |
569 |
55 |
6,629 |
2,426 |
9,712 |
| Jefferson |
49 |
442 |
55 |
10,035 |
2,998 |
13,579 |
| Jerome |
86 |
729 |
49 |
4,452 |
2,643 |
7,959 |
| Kootenai |
357 |
8,961 |
758 |
44,376 |
27,371 |
81,823 |
| Latah |
76 |
4,687 |
311 |
7,589 |
9,939 |
22,602 |
| Lemhi |
11 |
391 |
32 |
3,329 |
1,303 |
5,066 |
| Lewis |
6 |
162 |
10 |
1,242 |
551 |
1,971 |
| Lincoln |
9 |
168 |
16 |
1,312 |
601 |
2,106 |
| Madison |
95 |
617 |
196 |
12,909 |
4,622 |
18,439 |
| Minidoka |
25 |
590 |
36 |
4,818 |
2,219 |
7,688 |
| Nez Perce |
74 |
2,605 |
133 |
8,732 |
9,725 |
21,269 |
| Oneida |
7 |
95 |
20 |
1,880 |
455 |
2,457 |
| Owyhee |
30 |
433 |
35 |
3,247 |
1,398 |
5,143 |
| Payette |
43 |
978 |
76 |
6,606 |
3,786 |
11,489 |
| Power |
8 |
383 |
11 |
1,690 |
1,180 |
3,272 |
| Shoshone |
21 |
1,324 |
31 |
2,485 |
2,572 |
6,433 |
| Teton |
14 |
1,285 |
61 |
2,425 |
2,447 |
6,232 |
| Twin Falls |
137 |
3,266 |
280 |
19,881 |
11,979 |
35,543 |
| Valley |
18 |
1,019 |
49 |
3,480 |
2,399 |
6,965 |
| Washington |
12 |
398 |
28 |
3,549 |
1,239 |
5,226 |
| Total |
3,162 |
110,164 |
8,172 |
438,772 |
307,153 |
867,418 |